sym_glue.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 2,552 行 · 第 1/5 页

#ifndef MODULE
__setup("sym53c8xx=", sym53c8xx_setup);
#endif

/*
 *  Read and check the PCI configuration for any detected NCR 
 *  boards and save data for attaching after all boards have 
 *  been detected.
 */
static int __devinit
sym53c8xx_pci_init(struct pci_dev *pdev, struct sym_device *device)
{
	struct sym_pci_chip *chip;
	u_long base, base_2; 
	u_long base_c, base_2_c, io_port; 
	int i;
	u_short device_id, status_reg;
	u_char revision;

	/* Choose some short name for this device */
	sprintf(device->s.inst_name, "sym.%d.%d.%d", pdev->bus->number,
			PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));

	device_id = pdev->device;

	io_port = pdev->resource[0].start;

	base_c = pdev->resource[1].start;
	i = pci_get_base_address(pdev, 1, &base);

	base_2_c = pdev->resource[i].start;
	pci_get_base_address(pdev, i, &base_2);

	base	&= PCI_BASE_ADDRESS_MEM_MASK;
	base_2	&= PCI_BASE_ADDRESS_MEM_MASK;

	pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);

	/*
	 *  If user excluded this chip, do not initialize it.
	 */
	if (io_port) {
		for (i = 0 ; i < 8 ; i++) {
			if (sym_driver_setup.excludes[i] == io_port)
				return -1;
		}
	}

	/*
	 *  Check if the chip is supported.
	 */
	chip = sym_lookup_pci_chip_table(device_id, revision);
	if (!chip) {
		printf_info("%s: device not supported\n", sym_name(device));
		return -1;
	}

	/*
	 *  Check if the chip has been assigned resources we need.
	 *  XXX: can this still happen with Linux 2.6's PCI layer?
	 */
#ifdef SYM_CONF_IOMAPPED
	if (!io_port) {
		printf_info("%s: IO base address disabled.\n",
			    sym_name(device));
		return -1;
	}
#else
	if (!base) {
		printf_info("%s: MMIO base address disabled.\n",
			    sym_name(device));
		return -1;
	}
#endif

	/*
	 *  Ignore Symbios chips controlled by various RAID controllers.
	 *  These controllers set value 0x52414944 at RAM end - 16.
	 */
#if defined(__i386__)
	if (base_2_c) {
		unsigned int ram_size, ram_val;
		void *ram_ptr;

		if (chip->features & FE_RAM8K)
			ram_size = 8192;
		else
			ram_size = 4096;

		ram_ptr = ioremap(base_2_c, ram_size);
		if (ram_ptr) {
			ram_val = readl_raw(ram_ptr + ram_size - 16);
			iounmap(ram_ptr);
			if (ram_val == 0x52414944) {
				printf_info("%s: not initializing, "
					    "driven by RAID controller.\n",
					    sym_name(device));
				return -1;
			}
		}
	}
#endif /* i386 and PCI MEMORY accessible */

	/*
	 *  Copy the chip description to our device structure, 
	 *  so we can make it match the actual device and options.
	 */
	memcpy(&device->chip, chip, sizeof(device->chip));
	device->chip.revision_id = revision;

	/*
	 *  Some features are required to be enabled in order to 
	 *  work around some chip problems. :) ;)
	 *  (ITEM 12 of a DEL about the 896 I haven't yet).
	 *  We must ensure the chip will use WRITE AND INVALIDATE.
	 *  The revision number limit is for now arbitrary.
	 */
	if (device_id == PCI_DEVICE_ID_NCR_53C896 && revision < 0x4) {
		chip->features	|= (FE_WRIE | FE_CLSE);
	}

	/* If the chip can do Memory Write Invalidate, enable it */
	if (chip->features & FE_WRIE) {
		if (pci_set_mwi(pdev))
			return -1;
	}

	/*
	 *  Work around for errant bit in 895A. The 66Mhz
	 *  capable bit is set erroneously. Clear this bit.
	 *  (Item 1 DEL 533)
	 *
	 *  Make sure Config space and Features agree.
	 *
	 *  Recall: writes are not normal to status register -
	 *  write a 1 to clear and a 0 to leave unchanged.
	 *  Can only reset bits.
	 */
	pci_read_config_word(pdev, PCI_STATUS, &status_reg);
	if (chip->features & FE_66MHZ) {
		if (!(status_reg & PCI_STATUS_66MHZ))
			chip->features &= ~FE_66MHZ;
	} else {
		if (status_reg & PCI_STATUS_66MHZ) {
			status_reg = PCI_STATUS_66MHZ;
			pci_write_config_word(pdev, PCI_STATUS, status_reg);
			pci_read_config_word(pdev, PCI_STATUS, &status_reg);
		}
	}

 	/*
	 *  Initialise device structure with items required by sym_attach.
	 */
	device->pdev		= pdev;
	device->s.base		= base;
	device->s.base_2	= base_2;
	device->s.base_c	= base_c;
	device->s.base_2_c	= base_2_c;
	device->s.io_port	= io_port;
	device->s.irq		= pdev->irq;

	return 0;
}

/*
 * The NCR PQS and PDS cards are constructed as a DEC bridge
 * behind which sits a proprietary NCR memory controller and
 * either four or two 53c875s as separate devices.  We can tell
 * if an 875 is part of a PQS/PDS or not since if it is, it will
 * be on the same bus as the memory controller.  In its usual
 * mode of operation, the 875s are slaved to the memory
 * controller for all transfers.  To operate with the Linux
 * driver, the memory controller is disabled and the 875s
 * freed to function independently.  The only wrinkle is that
 * the preset SCSI ID (which may be zero) must be read in from
 * a special configuration space register of the 875.
 */
void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
{
	int slot;

	for (slot = 0; slot < 256; slot++) {
		u8 tmp;
		struct pci_dev *memc = pci_get_slot(pdev->bus, slot);

		if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
			pci_dev_put(memc);
			continue;
		}

		/*
		 * We set these bits in the memory controller once per 875.
		 * This isn't a problem in practice.
		 */

		/* bit 1: allow individual 875 configuration */
		pci_read_config_byte(memc, 0x44, &tmp);
		tmp |= 0x2;
		pci_write_config_byte(memc, 0x44, tmp);

		/* bit 2: drive individual 875 interrupts to the bus */
		pci_read_config_byte(memc, 0x45, &tmp);
		tmp |= 0x4;
		pci_write_config_byte(memc, 0x45, tmp);

		pci_read_config_byte(pdev, 0x84, &tmp);
		sym_dev->host_id = tmp;

		pci_dev_put(memc);

		break;
	}
}

/*
 *  Called before unloading the module.
 *  Detach the host.
 *  We have to free resources and halt the NCR chip.
 */
static int sym_detach(struct sym_hcb *np)
{
	printk("%s: detaching ...\n", sym_name(np));

	del_timer_sync(&np->s.timer);

	/*
	 * Reset NCR chip.
	 * We should use sym_soft_reset(), but we don't want to do 
	 * so, since we may not be safe if interrupts occur.
	 */
	printk("%s: resetting chip\n", sym_name(np));
	OUTB (nc_istat, SRST);
	UDELAY (10);
	OUTB (nc_istat, 0);

	sym_free_resources(np);

	return 1;
}

MODULE_LICENSE("Dual BSD/GPL");

/*
 * Driver host template.
 */
static struct scsi_host_template sym2_template = {
	.module			= THIS_MODULE,
	.name			= "sym53c8xx",
	.info			= sym53c8xx_info, 
	.queuecommand		= sym53c8xx_queue_command,
	.slave_configure	= sym53c8xx_slave_configure,
	.eh_abort_handler	= sym53c8xx_eh_abort_handler,
	.eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
	.eh_bus_reset_handler	= sym53c8xx_eh_bus_reset_handler,
	.eh_host_reset_handler	= sym53c8xx_eh_host_reset_handler,
	.this_id		= 7,
	.use_clustering		= DISABLE_CLUSTERING,
#ifdef SYM_LINUX_PROC_INFO_SUPPORT
	.proc_info		= sym53c8xx_proc_info,
	.proc_name		= NAME53C8XX,
#endif
};

static int attach_count;

static int __devinit sym2_probe(struct pci_dev *pdev,
				const struct pci_device_id *ent)
{
	struct sym_device sym_dev;
	struct sym_nvram nvram;
	struct Scsi_Host *instance;

	memset(&sym_dev, 0, sizeof(sym_dev));
	memset(&nvram, 0, sizeof(nvram));

	if (pci_enable_device(pdev))
		return -ENODEV;

	pci_set_master(pdev);

	if (pci_request_regions(pdev, NAME53C8XX))
		goto disable;

	sym_dev.host_id = SYM_SETUP_HOST_ID;
	if (sym53c8xx_pci_init(pdev, &sym_dev))
		goto free;

	sym_config_pqs(pdev, &sym_dev);

	sym_get_nvram(&sym_dev, &nvram);

	instance = sym_attach(&sym2_template, attach_count, &sym_dev);
	if (!instance)
		goto free;

	if (scsi_add_host(instance, &pdev->dev))
		goto detach;
	scsi_scan_host(instance);

	attach_count++;

	return 0;

 detach:
	sym_detach(pci_get_drvdata(pdev));
 free:
	pci_release_regions(pdev);
 disable:
	pci_disable_device(pdev);
	return -ENODEV;
}

static void __devexit sym2_remove(struct pci_dev *pdev)
{
	struct sym_hcb *np = pci_get_drvdata(pdev);
	struct Scsi_Host *host = np->s.host;

	scsi_remove_host(host);
	scsi_host_put(host);

	sym_detach(np);

	pci_release_regions(pdev);
	pci_disable_device(pdev);

	attach_count--;
}

static void sym2_get_offset(struct scsi_device *sdev)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	spi_offset(sdev) = tp->tinfo.curr.offset;
}

static void sym2_set_offset(struct scsi_device *sdev, int offset)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	if (tp->tinfo.curr.options & PPR_OPT_DT) {
		if (offset > np->maxoffs_dt)
			offset = np->maxoffs_dt;
	} else {
		if (offset > np->maxoffs)
			offset = np->maxoffs;
	}
	tp->tinfo.goal.offset = offset;
}


static void sym2_get_period(struct scsi_device *sdev)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	spi_period(sdev) = tp->tinfo.curr.period;
}

static void sym2_set_period(struct scsi_device *sdev, int period)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	if (period <= 9 && np->minsync_dt) {
		if (period < np->minsync_dt)
			period = np->minsync_dt;
		tp->tinfo.goal.options = PPR_OPT_DT;
		tp->tinfo.goal.period = period;
		if (!tp->tinfo.curr.offset ||
					tp->tinfo.curr.offset > np->maxoffs_dt)
			tp->tinfo.goal.offset = np->maxoffs_dt;
	} else {
		if (period < np->minsync)
			period = np->minsync;
		tp->tinfo.goal.options = 0;
		tp->tinfo.goal.period = period;
		if (!tp->tinfo.curr.offset ||
					tp->tinfo.curr.offset > np->maxoffs)
			tp->tinfo.goal.offset = np->maxoffs;
	}
}

static void sym2_get_width(struct scsi_device *sdev)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	spi_width(sdev) = tp->tinfo.curr.width ? 1 : 0;
}

static void sym2_set_width(struct scsi_device *sdev, int width)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	tp->tinfo.goal.width = width;
}

static void sym2_get_dt(struct scsi_device *sdev)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	spi_dt(sdev) = (tp->tinfo.curr.options & PPR_OPT_DT) ? 1 : 0;
}

static void sym2_set_dt(struct scsi_device *sdev, int dt)
{
	struct sym_hcb *np = ((struct host_data *)sdev->host->hostdata)->ncb;
	struct sym_tcb *tp = &np->target[sdev->id];

	if (!dt) {
		/* if clearing DT, then we may need to reduce the
		 * period and the offset */
		if (tp->tinfo.curr.period < np->minsync)
			tp->tinfo.goal.period = np->minsync;
		if (tp->tinfo.curr.offset > np->maxoffs)
			tp->tinfo.goal.offset = np->maxoffs;
		tp->tinfo.goal.options &= ~PPR_OPT_DT;
	} else {
		tp->tinfo.goal.options |= PPR_OPT_DT;
	}
}
	

static struct spi_function_template sym2_transport_functions = {
	.set_offset	= sym2_set_offset,
	.get_offset	= sym2_get_offset,
	.show_offset	= 1,
	.set_period	= sym2_set_period,
	.get_period	= sym2_get_period,
	.show_period	= 1,
	.set_width	= sym2_set_width,
	.get_width	= sym2_get_width,
	.show_width	= 1,
	.get_dt		= sym2_get_dt,
	.set_dt		= sym2_set_dt,
	.show_dt	= 1,
};

static struct pci_device_id sym2_id_table[] __devinitdata = {
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, sym2_id_table);

static struct pci_driver sym2_driver = {
	.name		= NAME53C8XX,
	.id_table	= sym2_id_table,
	.probe		= sym2_probe,
	.remove		= __devexit_p(sym2_remove),
};

static int __init sym2_init(void)
{
	sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
	if (!sym2_transport_template)
		return -ENODEV;

	pci_register_driver(&sym2_driver);
	return 0;
}

static void __exit sym2_exit(void)
{
	pci_unregister_driver(&sym2_driver);
	spi_release_transport(sym2_transport_template);
}

module_init(sym2_init);
module_exit(sym2_exit);